CN103155335A - Power conversion system for energy storage system and controlling method of the same - Google Patents
Power conversion system for energy storage system and controlling method of the same Download PDFInfo
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- CN103155335A CN103155335A CN2010800693768A CN201080069376A CN103155335A CN 103155335 A CN103155335 A CN 103155335A CN 2010800693768 A CN2010800693768 A CN 2010800693768A CN 201080069376 A CN201080069376 A CN 201080069376A CN 103155335 A CN103155335 A CN 103155335A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 71
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/493—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode the static converters being arranged for operation in parallel
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Inverter Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
A power conversion system for an energy storage system includes: at least two conversion units respectively configured to be coupled to one or more power sources or loads; and at least one output controller configured to generate at least one reference voltage to control at least one of the at least two conversion units, wherein the at least one of the at least two conversion units includes: a plurality of conversion subunits having inputs coupled to at least one of the power sources and having outputs that are coupled to one another; and at least one conversion subunit controller configured to adjust output voltages of the plurality of conversion subunits to be substantially the same corresponding to the at least one reference voltage, wherein the at least one reference voltage corresponds to the output voltages and output currents of the plurality of conversion subunits.
Description
Technical field
One or more embodiment of the present invention relates to the power conversion system for energy storage system, and the method for controlling this power conversion system.
Background technology
Because the exhaustion of the destruction of environment and natural resources is becoming more significantly problem, therefore be used for stored energy and effectively use the system of the energy of storing to begin to attract more concerns.In addition, about can not cause or less cause environmental pollution simultaneously the interest of the regenerative resource of generating power increase.With about the attitude of the nowadays change of environment developed energy storage system, this energy storage system can (except other interconnected factor) and battery and the interconnection of existing power grid of rechargeable energy, storage power with acting in agreement.
According to the power consumption of load, energy storage system can have various memory capacity.Therefore, for jumbo power is provided, energy storage system can be configured to be connected to a plurality of power sources that are connected in parallel.For example, energy storage system can be provided to the power from a plurality of power generation modules, and described a plurality of power generation modules are connected in parallel and from the regenerative resource generating power.Similarly, energy storage system can be parallel-connected to a plurality of batteries, in order to be provided to the power from battery.At this moment, energy storage system uses transducer that the power conversion that provides is the direct current link voltage.In this case, if the power that is converted is very large, can use a plurality of transducers.Similarly, if the power that is converted is very large, can use a lot of inverters by a plurality of inverters that are connected in parallel, these inverters are for example to be used for the alternating current power of power grid with the power transfer that provides.
Summary of the invention
Technical problem
One or more embodiment of the present invention comprises for the power conversion system of the energy storage system of the generation that reduces circulating current and the method for controlling this power conversion system.
Technical scheme
Some aspects according to an embodiment of the invention, the power conversion system that is used for energy storage system comprises: at least two converting units, it is configured to respectively be coupled to one or more power sources or load; And at least one o controller, it is configured to generate at least one reference voltage in order to control at least one converting unit in described at least two converting units, wherein, at least one converting unit in described at least two converting units comprises: a plurality of conversion subelements, its have be coupled in power source at least one input and output coupled to each other; And at least one conversion subelement controller, it is configured to the output voltage of described a plurality of conversion subelements is adjusted into corresponding with at least one reference voltage, essentially identical voltage, and wherein at least one reference voltage is corresponding to output voltage and the output current of described a plurality of conversion subelements.
Power conversion system can also comprise: direct current (DC) link unit, and it is coupled to described at least two converting units; And at least one switch, its converting unit in a side relative with DC link unit is coupled to described at least two converting units.
At least one o controller can comprise: power calculation unit,, separately power stages described a plurality of conversion subelements corresponding with output voltage and output current for calculating; Power comparison module is used for more calculated power stage; And the control signal generation unit, for generation at least one more corresponding reference voltage with calculated power stage.At least one o controller can also comprise: voltage measurement unit, for the output voltage of measuring described a plurality of conversion subelements; And current measuring unit, for the output current of measuring described a plurality of conversion subelements.
At least one converting unit at least two converting units can be configured to be coupled at least one direct current power source in the middle of power source, and wherein, described a plurality of conversion subelement comprises a plurality of transducers, and it is configured to carry out the DC-DC conversion in order to will be converted to from the input voltage level in described at least one direct current power source is the first voltage level substantially.
At least one direct current power source can comprise power generation system.
At least one direct current power source can comprise battery.At least one transducer in a plurality of transducers can also be configured to carry out the DC-DC conversion and be converted to and will be output to output battery, that have the second voltage level in order to will have the input of the first voltage level.
Each in a plurality of transducers can comprise inductor, switching device shifter, diode and capacitor, wherein, at least one conversion subelement controller is configured to adjust each output voltage in corresponding with at least one reference voltage, described a plurality of transducers by controlling each the operation of switching device shifter in described a plurality of transducer.
At least one converting unit at least two converting units can be configured to be coupled to one or more loads, described one or more load is configured to receive alternating current, wherein, described a plurality of conversion subelement comprises a plurality of inverters, and described a plurality of inverters are configured to and will are converted to and will be output to the alternating current of described one or more loads from least one the direct current in power source.
Can be configured to be provided at least one converting unit in described at least two converting units by DC link unit from least one the direct current in power source.
One or more loads can be configured to the first AC power operation, wherein at least one conversion subelement controller is configured to control described a plurality of inverter in order to direct current is converted to separately alternating current, and adjusts at least one in voltage level, current level, frequency or the phase place of the alternating current separately corresponding with the first AC power.At least one conversion subelement controller can be configured to control described a plurality of inverter in order to adjust the alternating current corresponding with described at least one reference voltage and commutating voltage.One or more loads can comprise power grid, wherein, at least one converting unit at least two converting units also comprises rectification circuit, and it is configured to the alternating current from power grid is converted to and will be output to the direct current of at least one power source in power source.
Each in a plurality of inverters can comprise at least four switching device shifters and comprise inductor and the filter circuit of capacitor, wherein, at least one conversion subelement controller is configured to adjust each alternating current in corresponding with described at least one reference voltage, described a plurality of inverters by the operation of controlling at least one switching device shifter in each described at least four switching device shifters in described a plurality of inverter.
A kind of power system can comprise: a plurality of energy storage systems, each energy storage system comprises power conversion system separately, wherein, a plurality of energy storage systems are configured to be coupled to one or more power generation systems, and are coupled at least one in power grid or other loads; And master controller, it is coupled to energy storage system, be used for to generate each output valve and/or the corresponding control signal of parameter with described a plurality of energy storage systems; Wherein, at least one o controller of each in described a plurality of energy storage system is configured to control output valve and/or the parameter in described a plurality of energy storage systems corresponding with control signal.
At least one o controller of one of a plurality of energy storage systems can comprise master controller.
Aspect according to another embodiment of the invention, a kind of method of the converting unit for the power ratio control converting system is provided, this power conversion system comprises: a plurality of conversion subelements, and it has the input of being coupled to one or more power sources and output coupled to each other; O controller; And at least one conversion subelement controller, the method comprises: output voltage and the output current of measuring described a plurality of conversion subelements; The power stage separately of described a plurality of power subelements that calculating is corresponding with output voltage and output current; More calculated power stage; Generate at least one the more corresponding reference voltage with calculated power stage; Generate the control signal corresponding with at least one reference voltage; And the control described a plurality of conversion subelements corresponding with control signal.
A plurality of conversion subelements can comprise a plurality of transducers, and it is configured to the first direct current from one or more power sources is converted to and will be output to the second direct current of DC link unit.
A plurality of conversion subelements can comprise a plurality of inverters, and it is configured to the direct current from one or more power sources is converted to and will be output to the alternating current of one or more loads.
Technique effect
According to some embodiments of the present invention, provide to be used for the power conversion system of energy storage system and the method for controlling this power conversion system, wherein this power conversion system reduces the generation of circulating current when power conversion.
Description of drawings
From the following description of by reference to the accompanying drawings embodiment, these and/or other aspect will become and clearly and more easily be understood, in the accompanying drawings:
Fig. 1 illustrates the schematic block diagram of the configuration of energy storage system according to an embodiment of the invention;
Fig. 2 illustrates the schematic block diagram of the part of the configuration of power conversion system according to an embodiment of the invention;
Fig. 3 a is the circuit diagram that the example of the transducer of Fig. 2 and converter controller is shown;
Fig. 3 b is the schematic block diagram of example that the o controller of Fig. 2 is shown;
Fig. 4 illustrates the flow chart of the method for transfer power according to an embodiment of the invention;
Fig. 5 is the schematic block diagram of a part that the configuration of power conversion system according to another embodiment of the invention is shown;
Fig. 6 a is the circuit diagram that the example of the inverter of Fig. 5 and circuit control device is shown;
Fig. 6 b is the schematic frame that the o controller example of Fig. 5 is shown;
Fig. 7 is the flow chart that the method for inverter power according to another embodiment of the invention is shown;
Fig. 8 is the schematic block diagram that the configuration that connects according to an embodiment of the invention a plurality of energy storage systems is shown; And
Fig. 9 is the schematic block diagram that the configuration of a plurality of energy storage systems of connection according to another embodiment of the invention is shown.
Implement best mode of the present invention
Some aspects according to an embodiment of the invention, the power conversion system that is used for energy storage system comprises: at least two converting units, it is configured to respectively be coupled to one or more power sources or load; And at least one o controller, it is configured to generate at least one reference voltage in order to control at least one converting unit in described at least two converting units, wherein, at least one converting unit in described at least two converting units comprises: a plurality of conversion subelements, its have be coupled in power source at least one input and output coupled to each other; And at least one conversion subelement controller, it is configured to the output voltage of described a plurality of conversion subelements is adjusted into corresponding with at least one reference voltage, essentially identical voltage, and wherein at least one reference voltage is corresponding to output voltage and the output current of described a plurality of conversion subelements.
Embodiment
The application requires on October 1st, 2010 to the priority of the 61/389th, No. 083 U.S. Provisional Application of USPTO submission, and its open integral body is by reference incorporated into here.
Although exemplary embodiment of the present invention easily is subject to various modifications and alternative form, its specific embodiment illustrates and will here describe in detail by the example in accompanying drawing.Yet, should be appreciated that, do not expect embodiments of the invention are restricted to particular forms disclosed, but on the contrary, exemplary embodiment of the present invention is intended to cover all modifications in the scope of the spirit and scope of the invention that falls into, is equal to and substitutes.In below describing, when known function and the detailed description of configuration when the theme of embodiments of the invention is not known incorporated into here, such details can be omitted.
Hereinafter, by being explained with reference to the drawings embodiments of the invention, will describe the present invention in detail.Identical Reference numeral represents identical element in the accompanying drawings, therefore can omit the description of repetition.
Fig. 1 illustrates the schematic block diagram of the configuration of energy storage system 1 according to an embodiment of the invention.
With reference to Fig. 1, energy storage system 1 offers power load 4 explicitly with power generation system 2 and electrical network 3 (for example, power grid) according to an embodiment of the invention.
Load 4 consumes from the power of power generation system 2 generations, the power that is stored in the power battery 30 and/or provides from electrical network 3.For example, the example of load 4 can be family or workshop etc.
PCS10 is provided to that need or necessary place to suitable level with the power from power generation system 2, electrical network 3 and battery 30 by the power transfer that will provide.PCS10 comprises power conversion unit 11, DC link unit 12, two-way inverter 13, bidirectional transducer 14, the first switch 15, second switch 16 and integrated manipulator 17.
According to the type of power generation system 2, power conversion unit 11 can be configured to be or comprise circuit for power conversion such as transducer or rectification circuit.When the power of power generation system 2 generations was direct current, power conversion unit 11 can comprise with DC converting being the transducer of direct current.When the power of power generation system 2 generations was interchange, power conversion unit 11 can comprise with exchange conversion being the rectification circuit of direct current.In addition, when power generation system 2 uses the solar energy generating power, power conversion unit 11 can comprise carries out the MPPT maximum power point tracking transducer that MPPT maximum power point tracking (MPPT) is controlled, so that power generation system 2 can generate according to the variation of solar radiation or temperature power maximum or that increase.Not during generating power, power conversion unit 11 can minimize or reduce power consumption by the operation that stops transducer or other elements that are associated when power generation system 2.
When a plurality of generation modules that comprise when power generation system 2 were connected in parallel, all a plurality of generation modules can both be connected to single circuit for power conversion.In addition, when the amount of the power that generates from generation module is very large, power conversion unit 11 can comprise a plurality of circuit conversion circuit or subelement, thereby the conversion of the power that generates from generation module can be carried out by divide power between change-over circuit or subelement.For example, if power generation system 2 is solar power generation systems, power generation system 2 can comprise a plurality of solar cells, and each solar cell can be connected to any MPPT transducer among a plurality of MPPT transducers that are connected in parallel.
In some cases, due to the voltage dip (voltage-sag) of power generation system 2 or electrical network 3 or due to the peak load that generates in load 4, the amplitude of direct current (DC) link voltage may be unsettled.Yet the DC link voltage should be stable for the normal running of two-way inverter 13 and bidirectional transducer 14.For example, DC link unit 12 can comprise for the large capacitor of stablizing the DC link voltage.Such DC link unit 12 can be connected between power conversion unit 11 and two-way inverter 13, in order to keep the DC link voltage.
Two-way inverter 13 is power conversion devices, and it can be connected between DC link unit 12 and the first switch 15.In discharge mode, two-way inverter 13 can comprise inverter, and it outputs to electrical network 3 by changing from the DC link voltage of power generation system 2 and/or battery 30 outputs with alternating voltage.In addition, under charge mode, two-way inverter 13 can comprise rectification circuit, and it exports the DC link voltage by rectification from the alternating voltage of electrical network 3, so that will be from the power storage of electrical network 3 in battery 30.
Two-way inverter 13 can comprise filter, is used for removing harmonic wave from the alternating current that outputs to electrical network 3.In addition, two-way inverter 13 can comprise phase-locked loop (PLL) circuit, is used for making Phase synchronization from the phase place of the alternating voltage of two-way inverter 13 outputs and the alternating voltage of electrical network 3 so that the generation of inhibition reactive power.In addition, two-way inverter 13 can be carried out the function such as scope range of the fluctuation of voltage restriction, power-factor improvement, flip-flop removal and transient phenomena protections (transient phenomena protection) etc.In the time needn't operating two-way inverter 13, two-way inverter 13 can be stopped to minimize or reduce power consumption.
When the amount of the power that provides from power generation system 2 or battery 30 was very large, two-way inverter 13 can comprise a plurality of inverters, thereby can carry out by divide power inverter to the conversion of the power that is used for electrical network 3 from the power that provides.For example, when power conversion unit 11 comprised a plurality of circuit for power conversion or subelement, each circuit for power conversion can be connected to a plurality of inverters that are connected in parallel.
When battery 30 comprised a plurality of battery carrier, these battery carriers can be connected to a bidirectional transducer 14.In addition, when the capacity of battery carrier was very large, bidirectional transducer 14 can comprise a plurality of transducers, thereby can carry out by divide power between transducer from the conversion of the power of battery carrier output.Here, battery carrier is the element of the bottom of setting battery 30.
The first switch 15 and second switch 16 are connected between two-way inverter 13 and electrical network 3, and can come current flowing between power ratio control generation system 2 and electrical network 3 by carry out on/off (ON/OFF) operation in response to the control of integrated manipulator 17.The ON/OFF operation of the first switch 15 and second switch 16 can be determined according to the state of power generation system 2, electrical network 3 and battery 30.For example, when the amplitude of the required power of load 4 was very large, the first switch 15 and second switch 16 both can become connection (on) thereby state can use the power in power generation system 2 and grid 3.If when the function that generates from power generation system 2 and grid 3 can not satisfy the power demand of load 4, in battery 30, the power of storage can also be provided for load 4.Yet when having power failure in electrical network 3, second switch 16 becomes disconnection (OFF) state, and the first switch 15 becomes the ON state.By this way, load 4 can be provided for from the power of power generation system 2 or battery 30, and flowing of 3 power can be prevented from PCS10 to the electrical network.Therefore, can prevent such as the workman by the accident of the power line of electrical network 3 electric shock.
Integrated manipulator 17 can monitor the state of power generation system 2, electrical network 3, battery 30 and load 4, and in response to monitoring result power ratio control converting unit 11, two-way inverter 13, bidirectional transducer 14, the first switch 15, second switch 16 and BMS20.Integrated manipulator 17 can comprise whether existing power failure and/or power whether to generate from power generation system 2 in monitoring electrical network 3.In addition, integrated manipulator 17 can also monitor from the amount of the power of power generation system 2 generations, the charged state of battery 30, power consumption and the time of load 4 except can monitoring other parameter.Therefore, integrated manipulator can comprise or can be made of following one or more o controllers that more discuss in detail, that be associated with power conversion unit 11, two-way inverter 13 and/or bidirectional transducer 14.
BMS20 is connected to battery 30, and controls the charging and discharging of battery 30 in response to the control of integrated manipulator 17.For example, BMS20 can carry out overcharge protection, deep-discharge protection, excess current protective function, over-voltage protection function, overheat protective function and/or battery unit (cell) equilibrium function, so that protection battery 30.Therefore, BMS20 can monitor voltage, electric current, temperature, dump power, life-span and the charged state of battery 30, and will monitor that result is applied to integrated manipulator 17.
According to current embodiment, according to the capacity of energy storage system 1, energy storage system 1 can comprise a plurality of circuit for power conversion, a plurality of transducer and/or a plurality of inverter.Yet, when transducer or inverter are connected in parallel, according to the handover operation of switching device shifter included in each in transducer or inverter, various parameters, for example, in the output voltage of the output stage of transducer or inverter or amplitude or the phase place of output current, can be different.Here, parameter can be typical example as the element from the characteristic of the power of transducer or inverter output, but parameter is not limited to above-mentioned parameter according to an embodiment of the invention.Because parameter is different in the output stage of transducer or inverter, therefore can be between transducer or inverter the generation cycle electric current.Like this, can be in circuit for power conversion the generation cycle electric current.Therefore, prevent or reduce that the generation cycle electric current is very main in energy storage system 1.Therefore, will describe according to an embodiment of the invention now, in the method that prevents or reduce generation cycle electric current in energy storage system 1.
Fig. 2 illustrates the schematic block diagram of the part of the configuration of PCS10 according to an embodiment of the invention.
With reference to Fig. 2, PCS10 comprises a plurality of conversion subelements that are connected in parallel, such as transducer 100.The power that transducer 100 receives from direct current power source 200.Transducer 100 is exported the power corresponding with reference voltage by the voltage of the power that conversion receives, and this reference voltage can be the voltage that sets in advance.The output stage of transducer 100 is by public connection, and the power that outputs to the output stage of transducer 100 can be provided for DC link unit 12.Here, direct current power source 200 can be the power from power generation system 2 or battery 30 outputs.
Each in transducer 100 can also comprise such as the conversion subelement controller of converter controller 110 or with conversion subelement controller such as converter controller 110 and being associated, and converter controller 110 is provided by the conversion of the power that provides.By for example controlling the duty ratio of switching device included in transducer 100, converter controller 110 is basic identical with reference voltage with the voltage control of the power of output.Here, each in transducer 100 can be included in one of power conversion unit 11 or bidirectional transducer 14.
In current embodiment, described each converter controller 110 and controlled single transducer 100.Yet this is example, and embodiments of the invention are not limited to this.For example, converting unit can be configured to make a plurality of converter controllers 110 to be integrated into and control transducer 100 in single IC.In addition, o controller 40 for example can be included in converting unit, and perhaps replacedly, o controller 40 can be included in as described in Figure 1 integrated manipulator 17.
The method that prevents the generation cycle electric current by controlling transducer 100 will be described now in more detail.
Fig. 3 a is the circuit diagram that the example of the transducer 100 of Fig. 2 and converter controller 110 is shown, and Fig. 3 b is the schematic block diagram of example that the o controller 40 of Fig. 2 is shown.Fig. 4 illustrates the flow chart of the method for transfer power according to an embodiment of the invention.
With reference to Fig. 3 a and Fig. 3 b, PCS10 can comprise the first transducer 100a, the second transducer 100b, converter controller 110 and o controller 40.
The first transducer 100a can be boost converter, and it comprises the first inductor L1, the first switching device shifter SW1, the first diode D1 and the first capacitor C1.The second transducer 100b can be also boost converter, and it comprises the second inductor L2, the second switching device shifter SW2, the second diode D2 and the second capacitor C2.Yet the configuration of transducer 100 is examples, and should be not limited to this.Transducer 100 can have various configurations.
The first transducer 100a and the second transducer 100b receive respectively the direct current power from the first direct current power source 200a and the second direct current power source 200b.The first transducer 100a and the second transducer 100b are connected in parallel, and the output stage of the first transducer 100a and the second transducer 100b can be connected to DC link unit 12.The first transducer 100a and the second transducer 100b can be included transducers in power conversion unit 11 and/or bidirectional transducer 14 for example.Control the voltage increase of the first transducer 100a and the second transducer 100b or the ratio that reduces according to the handover operation of the first switching device shifter SW1 and the second switching device shifter SW2, and as a result of, can determine or adjust the amplitude of output voltage.
The comparative result that control signal generation unit 45 receives from the power stage of power comparison module 44, and generate the control signal that is used for controlling converter controller 110 according to this comparative result.This control signal can be the signal that represents the first reference voltage Vref 1 and the second reference voltage Verf2, and the first reference voltage Vref 1 and the second reference voltage Verf2 are converted respectively device controller 110 and are used for controlling the first transducer 100a and the second transducer 100b.
As mentioned above, can be included in reference in the described integrated manipulator 17 of Fig. 1 according to the o controller 40 of current embodiment of the present invention, can be perhaps the attachment device that separates with integrated manipulator 17 in Fig. 1.
May reside in such as the spurious impedance element of parasitic conductance or parasitic capacitance in the wire between the output stage of the first transducer 100a and the second transducer 100b.Therefore, although that the first output voltage V 1 and the second output voltage V 2 are shown in same node point in Fig. 3 a is measured, this is only for convenience of explanation.In other words, the first output voltage V 1 and the second output voltage V 2 can have different values, and can come independent measurement with various method.
Hereinafter, present method with the converter controller 110 in description control PCS10 and o controller 40.
With reference to Fig. 4, o controller 40 is measured output voltage and the output current (step 10) of the first transducer 100a and the second transducer 100b.
When the output voltage of the first transducer 100a and the second transducer 100b and output current were measured respectively, o controller 40 multiply by by the output voltage that will measure the power stage (step 11) that the output current of having measured calculates the first transducer 100a and the second transducer 100b.
When the power stage of the first transducer 100a and the second transducer 100b is calculated respectively, the more calculated power stage (step 12) of o controller 40.
According to the comparative result of power stage, o controller 40 generates the control signal (step 13) of the power stage basic synchronization that makes transducer.Be used for to be used as control signal to reference voltage Vref 1 and Vref2 that the waveform of the control signal S1 that generates from converter controller 110 and S2 is controlled.For example, result as a comparison, during greater than the power stage of the second transducer 100b, the amplitude of the first reference voltage Verf1 can be reduced, in order to reduce the power stage of the first transducer 100a when the power stage of the first transducer 100a.Replacedly, the amplitude of the second reference voltage Verf2 can be increased, in order to increase the power stage of the second transducer 100b.
The signal that has generated that represents reference voltage Verf1 and Verf2 is applied to converter controller 110, and converter controller 110 generates for the control signal S1 that controls respectively the first switching device shifter SW1 and the second switching device shifter SW2 and S2(step 14) according to the reference voltage Verf1 that has applied and Verf2 and the output voltage V 1 of having measured and V2.Here, control signal S1 and S2 can be the pulse width modulating signals for the duty ratio of controlling the first switching device shifter SW1 and the second switching device shifter SW2.
As mentioned above, in PCS10 according to an embodiment of the invention, be controlled to be by each in a plurality of controllers that will be connected in parallel and have essentially identical power stage, can reduce the generation of the circulating current between these controllers.
In current embodiment, in two transducer 100a and 100b, the method that prevents or reduce the generation of circulating current has been described.Yet, the invention is not restricted to this, that is, the present invention also can be applied to the situation that plural transducer is connected in parallel.
Fig. 5 is the schematic block diagram of a part that the configuration of power conversion system (PCS) 10 according to another embodiment of the invention is shown.
With reference to Fig. 5, PCS10 comprises a plurality of conversion subelements that are connected in parallel, such as inverter 300.The power that inverter 300 receives from direct current power source 200.Inverter 300 is power output after direct current power being transformed to AC power, thereby the power that provides for example can have, the value that sets in advance of voltage, electric current, phase place and/or frequency.The output stage of inverter 300 is by public connection, and the AC power that outputs to output stage can be provided for electrical network 3 or load 4.Here, direct current power source 200 can be from the power of power generation system 2 or battery 30 outputs or from the power of its conversion.
Each inverter 300 can also comprise such as the conversion subelement controller of circuit control device 310 or with conversion subelement controller such as circuit control device 310 and being associated, and conversion subelement controller is provided by the conversion of the power that provides.Circuit control device 310 for example operates to control by the ON/OFF that is included in the switching device shifter in inverter 300 power of having exported becomes and the essentially identical AC power of the AC power of electrical network 3 it.
In current embodiment, described each circuit control device 310 and controlled single inverter 300.Yet this is example, and embodiments of the invention are not limited to this.For example, converting unit can be configured to make a plurality of circuit control devices 310 to be integrated into to come control inverter 300 in single IC.In addition, with discuss in formerly embodiment similar, o controller 40 for example can be included in converting unit, perhaps replacedly, o controller 40 can be included in as described in Figure 1 integrated manipulator 17.
Now the method that prevents the generation cycle electric current by the inverter 300 of control chart 5 will be described in more detail.
Fig. 6 a is the circuit diagram that the example of the inverter 300 of Fig. 5 and circuit control device 310 is shown, and Fig. 6 b is the schematic block diagram of example that the o controller 40 of Fig. 5 is shown.Fig. 7 is the flow chart that the method for inverter power according to another embodiment of the invention is shown.
With reference to Fig. 6 a and Fig. 6 b, PCS10 can comprise the first inverter 300a, the second inverter 300b, the first circuit control device 310a, the second circuit control device 310b and o controller 40.
The first inverter 300a can be full-bridge inverter, and it comprises a plurality of switching device shifter SW3-1 to SW3-4, and the first inverter 300a can also comprise filter circuit, and it comprises the 3rd inductor L3 and the 3rd capacitor C3.The second inverter 300b can be also full-bridge inverter, and it comprises a plurality of switching device SW4-1 to SW4-4, and the second inverter 300b can also comprise filter circuit, and it comprises the 4th inductor L4 and the 4th capacitor C4.Yet the configuration of inverter 300 is examples, and should be not limited to this.Inverter 300 can have various configurations.For example, half-bridge inverter, pulse width modulation (PWM) inverter etc. can be used as inverter 300.
The first inverter 300a and the second inverter 300b receive respectively the direct current power from the 3rd direct current power source 200c and the 4th direct current power source 200d.The 3rd direct current power 200c and the 4th direct current power source 200d can be, for example power generation system 2 or battery 30.The first inverter 300a and the second inverter 300b can be connected in parallel, and the output stage of the first inverter 300a and the second inverter 300b can be connected to electrical network 3 or load 4.The first inverter 300a and the second inverter 300b can be the inverters that is included in bidirectional transducer 14.
According to the handover operation of switching device shifter SW3-1 to SW3-4 and SW4-1 to SW4-4, can control output voltage, output current, phase place and/or the frequency of the power stage of the first inverter 300a and the second inverter 300b.
The first circuit control device 310a can generate the control signal S3-1 to S3-4 for the ON/OFF operation of controlling switching device shifter SW3-1 to SW3-4.It is voltage from the first inverter 300a output for the 3rd output voltage V 3() and the 3rd output current I3(it be the electric current of exporting from the first inverter 300a) can be applied to the first circuit control device 310a.In addition, the signal by the 3rd reference voltage Verf3 that the power of electrical network 3 and/or representative are sent from o controller 40 carries out the commutating voltage Vrec that rectifier obtains and can be applied to the first circuit control device 310a.
The first circuit control device 310a can comprise voltage controller and current controller.
Voltage controller can generate the current command signal that the 3rd output voltage V 3 is synchronizeed with the 3rd reference voltage Vref 3.Voltage controller can also generate the current command signal by carrying out proportional plus integral control, and the difference between the 3rd output voltage V 3 and the 3rd reference voltage Vref 3 is used in this proportional plus integral control.
Current controller can generate the control signal S3-1 to S3-4 that the 3rd output current I3 is synchronizeed with current reference signal.Current controller can generate control signal by carrying out proportional plus integral control, and the difference between the 3rd output current I3 and current reference signal is used in this proportional plus integral control.At this moment, current reference signal can be by generating the current command signal times with commutating voltage Vrec.
Similar with the first circuit control device 310a, the second circuit control device 310b can generate the control signal S4-1 to S4-4 for the ON/OFF operation of controlling switching device shifter SW4-1 to SW4-4.It is voltage from the second inverter 300b output for the 4th output voltage V 4(), the 4th output current I4(it be electric current from the second inverter 300b output), commutating voltage Vrec and/or representative can be applied to the second circuit control device 310b from the signal of the 4th reference voltage Verf4 that o controller 40 sends.
Similar with the first inverter 300a, the second inverter 300b can also comprise voltage controller and/or current controller.Description to the operation of the voltage controller of the second inverter 300b and/or current controller will no longer repeat.
The comparative result that control signal generation unit 45 receives from the power stage of power comparison module 44, and generate the control signal that is used for controlling the first circuit control device 310a and the second circuit control device 310b according to this comparative result.This control signal can be the signal that represents the 3rd reference voltage Vref 3 and the 4th reference voltage Verf4, and the 3rd reference voltage Vref 3 and the 4th reference voltage Verf4 are used for controlling the first inverter 300a and the second inverter 300b by the first circuit control device 310a and the second circuit control device 310b respectively.
As mentioned above, can be included in reference in the described integrated manipulator 17 of Fig. 1 according to the o controller 40 of current embodiment of the present invention, can be perhaps the attachment device that separates with integrated manipulator 17 in Fig. 1.
May reside in such as the spurious impedance element of parasitic conductance or parasitic capacitance in the wire between the output stage of the first inverter 300a and the second inverter 300b.Therefore, although that the 3rd output voltage V 3 and the 4th output voltage V 4 are shown in same node point in Fig. 6 a is measured, this is only for convenience of explanation.In other words, the 3rd output voltage V 3 and the 4th output voltage V 4 can have different values, and can come independent measurement with various method.
Hereinafter, present method with the first circuit control device 310a in description control PCS10 and the second circuit control device 310b and o controller 40.
With reference to Fig. 7, o controller 40 is measured output voltage and the output current (step 20) of the first inverter 300a and the second inverter 300b.
When the output voltage of the first inverter 300a and the second inverter 300b and output current were measured respectively, o controller 40 multiply by by the output voltage that will measure the power stage (step 21) that the output current of having measured calculates the first inverter 300a and the second inverter 300b.
When the power stage of the first inverter 300a and the second inverter 300b is calculated respectively, the more calculated power stage of o controller 40 (step 22).
According to the comparative result of power stage, o controller 40 generates the control signal (step 23) of the power stage basic synchronization that makes inverter.Be used for to be used as control signal to the 3rd reference voltage Vref 3 and the 4th reference voltage Vref 4 that the waveform of the control signal S3-1 to S3-4 that generates from the first circuit control device 310a and the second circuit control device 310b and S4-1 to S4-4 is controlled.For example, result as a comparison, during greater than the power stage of the second inverter 300b, the amplitude of the 3rd reference voltage Vref 3 can be reduced, in order to reduce the power stage of the first inverter 300a when the power stage of the first inverter 300a.Replacedly, the amplitude of the 4th reference voltage Vref 4 can be increased, in order to increase the power stage of the second inverter 300b.
the 3rd reference voltage Vref 3 that has generated and the 4th reference voltage Vref 4 are respectively applied to the first circuit control device 310a and the second circuit control device 310b, and first circuit control device 310a and the second circuit control device 310b can be according to the 3rd reference voltage Vref 3 that has applied and the 4th reference voltage Vref 4, the 3rd output voltage V 3 of having measured and the 4th output voltage V 4, and/or the 3rd output current I3 and the 4th output current I4 generate for the control signal S3-1 to S3-4 that controls respectively switching device shifter SW3-1 to SW3-4 and SW4-1 to SW4-4 and S4-1 to S4-4(step 24).Here, control signal S3-1 to S3-4 and S4-1 to S4-4 can be the pulse width modulating signals for the duty ratio of controlling switching device shifter SW3-1 to SW3-4 and SW4-1 to SW4-4.
The first circuit control device 310a and the second circuit control device 310b are applied to respectively by signal S3-1 to S3-4 and the S4-1 to S4-4 that will generate the operation (step 25) that switching device shifter SW3-1 to SW3-4 and SW4-1 to SW4-4 control the first inverter 300a and the second inverter 300b.
As mentioned above, PCS10 according to another embodiment of the invention is controlled to be by each in a plurality of inverters that will be connected in parallel and has essentially identical power stage, can reduce the generation of the circulating current between a plurality of inverters.In current embodiment, the amplitude of power output is compared.Yet this is example, therefore, it will be appreciated by those skilled in the art that and can make various configurations in order to make power stage synchronous by the various parameters (such as phase place or frequency) that compare except the amplitude of power stage.
In current embodiment, in two inverter 300a and 300b, the method that prevents or reduce the generation of circulating current has been described.Yet, the invention is not restricted to this, that is, the present invention also can be applied to the situation that plural inverter is connected in parallel.
Fig. 8 is the schematic block diagram that the configuration that connects according to an embodiment of the invention a plurality of energy storage systems 1 is shown.Fig. 8 shows as the situation spread scenarios of the embodiment of Fig. 5 to Fig. 7, that a plurality of energy storage systems 1 are connected to single load 4.
In the situation that current embodiment, each energy storage system 1 can comprise for the two-way inverter 13 that power is offered load 4.Therefore, the two-way inverter 13 that is included in each energy storage system 1 can be connected in parallel with respect to load 4, and because the parameter between the power that outputs to load 4 from each energy storage system 1 is different, therefore can be between energy storage system 1 the generation cycle electric current.Yet, in current embodiment, can prevent or reduce generation cycle electric current between energy storage system 1.
With reference to Fig. 8, can comprise load 4, a plurality of energy storage systems 1 that are connected in parallel and master controller 50 according to the configuration of the method that power conversion is shown of current embodiment.
Each energy storage system 1 can be separately or jointly is connected to power generation system 2.In addition, each energy storage system 1 can receive the power from electrical network 3.
Each energy storage system 1 can be measured by o controller 40 value of various parameters of the power stage of two-way inverters 13, and the value of the parameter measured can be applied to master controller 50.
The method of rated output and control o controller 40 in master controller 50, and making the method for power stage basic synchronization can be basic identical with above description with reference to Fig. 5 to Fig. 7 by controlling the two-way inverter 13 corresponding with o controller 40, therefore similar description will no longer repeat.
Fig. 9 is the schematic block diagram that the configuration of a plurality of energy storage systems 1 of connection according to another embodiment of the invention is shown.
With reference to Fig. 9, in current embodiment, the function of the master controller 50 of Fig. 8 can be included in one of o controller 40 in one of energy storage system 1.Therefore, each o controller 40 can be measured the value of the various parameters of corresponding power output, and the value of the parameter measured can be imposed on the o controller 40 of the function of carrying out master controller 50.In addition, the o controller 40 of carrying out the function of master controller 50 can calculate each power stage based on the value that receives, and can generate for the control signal of controlling each o controller 40.Basic identical according to the operation of the master controller 50 of the operation of the o controller 40 of current embodiment and Fig. 8 and o controller 40, therefore, their description will no longer repeat.
As mentioned above, when a plurality of energy storage systems 1 are parallel-connected to load 4, can be controlled by master controller 50 or the o controller 40 of carrying out the function of such master controller 50 from the power output of each energy storage system 1 output, thereby be made described power output basic synchronization.Therefore, can reduce generation cycle electric current between energy storage system 1.
It should be understood that one exemplary embodiment described herein only should be regarded as for descriptive sense, rather than in order to limit.Feature in each embodiment or the description of aspect should be considered to can be used for other similar characteristics or the aspect in other embodiment.Should also be understood that the present invention is intended to cover various modifications and the equivalent arrangements in the spirit and scope that are included in claims and are equal to.
Claims (20)
1. power conversion system that is used for energy storage system, this power conversion system comprises:
At least two converting units, it is configured to respectively be coupled to one or more power sources or load; And
At least one o controller, it is configured to generate at least one reference voltage in order to control at least one converting unit in described at least two converting units,
Wherein, at least one converting unit in described at least two converting units comprises:
A plurality of conversion subelements, its have be coupled in power source at least one input and output coupled to each other; And
At least one conversion subelement controller, it is configured to the output voltage of described a plurality of conversion subelements is adjusted into corresponding with at least one reference voltage, essentially identical voltage,
Wherein, at least one reference voltage is corresponding to output voltage and the output current of described a plurality of conversion subelements.
2. power conversion system as claimed in claim 1 also comprises:
Direct current (DC) link unit, it is coupled to described at least two converting units; And
At least one switch, its converting unit in a side relative with DC link unit is coupled to described at least two converting units.
3. power conversion system as claimed in claim 1, wherein, described at least one o controller comprises:
Power calculation unit,, separately power stages described a plurality of conversion subelements corresponding with output voltage and output current for calculating;
Power comparison module is used for more calculated power stage; And
The control signal generation unit is for generation at least one more corresponding reference voltage with calculated power stage.
4. power conversion system as claimed in claim 3, wherein, described at least one o controller also comprises:
Voltage measurement unit is for the output voltage of measuring described a plurality of conversion subelements; And
Current measuring unit is for the output current of measuring described a plurality of conversion subelements.
5. power conversion system as claimed in claim 1, wherein, at least one converting unit in described at least two converting units is configured to be coupled at least one direct current power source in the middle of power source, and
Wherein, described a plurality of conversion subelements comprise a plurality of transducers, and it is configured to carry out the DC-DC conversion is the first voltage level in order to will be converted to from the input voltage level of described at least one direct current power source substantially.
6. power conversion system as claimed in claim 5, wherein, described at least one direct current power source comprises power generation system.
7. power conversion system as claimed in claim 5, wherein, described at least one direct current power source comprises battery.
8. power conversion system as claimed in claim 7, wherein, at least one transducer in described a plurality of transducer also is configured to carry out DC-DC conversion and is converted to and will be output to output battery, that have the second voltage level in order to will have the input of the first voltage level.
9. power conversion system as claimed in claim 5, wherein, each in described a plurality of transducer comprises inductor, switching device shifter, diode and capacitor, and wherein, described at least one conversion subelement controller is configured to adjust each output voltage in corresponding with at least one reference voltage, described a plurality of transducers by controlling each the operation of switching device shifter in described a plurality of transducer.
10. power conversion system as claimed in claim 1, wherein, at least one converting unit in described at least two converting units is configured to be coupled to one or more loads, described one or more load is configured to receive alternating current, and wherein, described a plurality of conversion subelement comprises a plurality of inverters, and described a plurality of inverters are configured to and will are converted to and will be output to the alternating current of described one or more loads from least one the direct current in power source.
11. power conversion system as claimed in claim 10 wherein, is configured to be provided at least one converting unit in described at least two converting units by DC link unit from least one the direct current in power source.
12. power conversion system as claimed in claim 10, wherein, described one or more load is configured to the first AC power operation, wherein said at least one conversion subelement controller is configured to control described a plurality of inverter in order to direct current is converted to separately alternating current, and adjusts at least one in voltage level, current level, frequency or the phase place of the alternating current separately corresponding with the first AC power.
13. power conversion system as claimed in claim 12, wherein, described at least one conversion subelement controller is configured to control described a plurality of inverter in order to adjust the alternating current corresponding with described at least one reference voltage and commutating voltage.
14. power conversion system as claimed in claim 13, wherein, described one or more load comprises power grid, and wherein, at least one converting unit in described at least two converting units also comprises rectification circuit, and it is configured to the alternating current from power grid is converted to and will be output to the direct current of at least one power source in power source.
15. power conversion system as claimed in claim 10, wherein, each in described a plurality of inverter comprises at least four switching device shifters and comprises inductor and the filter circuit of capacitor, and wherein, described at least one conversion subelement controller is configured to adjust each alternating current in corresponding with described at least one reference voltage, described a plurality of inverters by the operation of controlling at least one switching device shifter in each described at least four switching device shifters in described a plurality of inverter.
16. a power system comprises:
A plurality of energy storage systems, each energy storage system comprises power conversion system separately as claimed in claim 10, wherein, described a plurality of energy storage systems are configured to be coupled to one or more power generation systems, and are coupled at least one in power grid or other loads; And
Master controller, it is coupled to energy storage system, be used for to generate each output valve and/or the corresponding control signal of parameter with described a plurality of energy storage systems;
Wherein, at least one o controller of each in described a plurality of energy storage system is configured to control each output valve and/or the parameter in described a plurality of energy storage systems corresponding with control signal.
17. power system as claimed in claim 16, wherein, at least one o controller of one of described a plurality of energy storage systems comprises master controller.
18. a method that is used for the converting unit of power ratio control converting system, this power conversion system comprises: a plurality of conversion subelements, and it has the input of being coupled to one or more power sources and output coupled to each other; O controller; And at least one conversion subelement controller, the method comprises:
Measure output voltage and the output current of described a plurality of conversion subelements;
The power stage separately of described a plurality of conversion subelements that calculating is corresponding with output voltage and output current;
More calculated power stage;
Generate at least one the more corresponding reference voltage with calculated power stage;
Generate the control signal corresponding with at least one reference voltage; And
Control the described a plurality of conversion subelements corresponding with control signal.
19. method as claimed in claim 18, wherein, described a plurality of conversion subelements comprise a plurality of transducers, and it is configured to the first direct current from one or more power sources is converted to and will be output to the second direct current of DC link unit.
20. method as claimed in claim 18, wherein, described a plurality of conversion subelements comprise a plurality of inverters, and it is configured to the direct current from one or more power sources is converted to and will be output to the alternating current of one or more loads.
Applications Claiming Priority (3)
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| US61/389,083 | 2010-10-01 | ||
| PCT/KR2010/007490 WO2012043919A1 (en) | 2010-10-01 | 2010-10-28 | Power conversion system for energy storage system and controlling method of the same |
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| CN103155335A true CN103155335A (en) | 2013-06-12 |
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| CN2010800693768A Pending CN103155335A (en) | 2010-10-01 | 2010-10-28 | Power conversion system for energy storage system and controlling method of the same |
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| US (1) | US20130181519A1 (en) |
| EP (1) | EP2622704A4 (en) |
| JP (1) | JP5676767B2 (en) |
| KR (1) | KR20130099022A (en) |
| CN (1) | CN103155335A (en) |
| WO (1) | WO2012043919A1 (en) |
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Also Published As
| Publication number | Publication date |
|---|---|
| KR20130099022A (en) | 2013-09-05 |
| EP2622704A4 (en) | 2014-07-23 |
| US20130181519A1 (en) | 2013-07-18 |
| JP2013540413A (en) | 2013-10-31 |
| JP5676767B2 (en) | 2015-02-25 |
| WO2012043919A1 (en) | 2012-04-05 |
| EP2622704A1 (en) | 2013-08-07 |
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